US4330458A
Expired / Lapsed
US
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High solids coating composition of a blend of a low molecular weight acrylic polymer and a medium molecular weight acrylic polymer and an alkylated melamine cross-linking agent
Assignee: EIDP Inc
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Filing: 1980-04-28
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Granted: 1982-05-18
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Expires: 2000-04-28
Abstract
Abstract The high solids coating composition contains at least 50% by weight of a binder of film-forming constituents in which the constituents are of (A) a medium molecular weight acrylic polymer that has a number average molecular weight of about 5,000-20,000, a hydroxyl content of at least 2% by weight, a glass transition temperature of about -20° C. to +25° C., and is of an alkyl methacrylate, a hydroxy alkyl acrylate or a hydroxy alkyl methacrylate, and optionally, an alkyl acrylate or styrene; (B) a low molecular weight acrylic polymer that has a number average molecular weight of about 500-7,500 a hydroxyl content of at least 2% by weight, a glass transition temperature of about -20° C. to +25° C., and is of an alkyl methacrylate, a hydroxy alkyl acrylate or a hydroxy alkyl methacrylate, and optionally, an alkyl acrylate and styrene; (C) an alkylated melamine formaldehyde cross-linking agent; and an acid catalyst; the composition is particularly useful as an exterior finish for automobiles, trucks, airplanes and can be used as an appliance finish and for coil coatings.
Inventors
- 👤 Harry J. Spinelli
- 👤 Alan L. Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:45
CPC Classifications
C; C09; C09D; C09D133/00; C09D133/04; C09D133/06; C09D133/062; C09D133/066; C08; C08L; C08L2205/00; C08L2205/02; C08L33/00; C08L33/04; C08L33/06; C08L33/062; C08L33/066; C08L61/00; C08L61/20
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
203 words
A high solids coating composition comprising at least 50% by weight of a binder of film-forming constituents and up to 50% by weight of a nonaqueous liquid carrier; in which the film-forming constituents consist essentially of (A) about 5-45% by weight of a medium molecular weight acrylic polymer having a number average molecular weight, determined by gel permeation chromotography, of about 5,000-20,000, a hydroxyl content of about 2-10% by weight, a glass transition temperature of about -20° C. to +25° C., (B) about 10-50% by weight of a low molecular weight acrylic polymer having a number average molecular weight determined as above of about 500-7,500, a hydroxyl content of about 2-10% by weight, a glass transition temperature of about -20° C. to +25° C.; and wherein the acrylic polymers being the same or different consist essentially of 1- 82% by weight of methyl methacrylate, 2-50% by weight of an alkyl methacrylate or an alkyl acrylate each having 2-18 carbon atoms in the alkyl group, and 16-35% by weight of a hydroxy alkyl acrylate or a hydroxy alkyl methacrylate, each having 2-4 carbon atoms in the alkyl group and wherein the difference in molecular weight between the acrylic polymers is at least 3000; and
Claim 2
Dependent Claim
203 words
A high solids coating composition comprising at least 50% by weight of a binder of film-forming constituents and up to 50% by weight of a nonaqueous liquid carrier; in which the film-forming constituents consist essentially of (A) about 5-45% by weight of a medium molecular weight acrylic polymer having a number average molecular weight, determined by gel permeation chromotography, of about 5,000-20,000, a hydroxyl content of about 2-10% by weight, a glass transition temperature of about -20° C. to +25° C., (B) about 10-50% by weight of a low molecular weight acrylic polymer having a number average molecular weight determined as above of about 500-7,500, a hydroxyl content of about 2-10% by weight, a glass transition temperature of about -20° C. to +25° C.; and wherein the acrylic polymers being the same or different consist essentially of 1- 82% by weight of methyl methacrylate, 2-50% by weight of an alkyl methacrylate or an alkyl acrylate each having 2-18 carbon atoms in the alkyl group, and 16-35% by weight of a hydroxy alkyl acrylate or a hydroxy alkyl methacrylate, each having 2-4 carbon atoms in the alkyl group and wherein the difference in molecular weight between the acrylic polymers is at least 3000; and
Claim 3
Dependent Claim
36 words
(C) about 25-45% by weight of an alkylated melamine formaldehyde cross-linking agent having 1-4 carbon atoms in the alkyl group; and in addition to the film-forming constituents contains about 0.1-2.0% by weight of an acid catalyst.
Claim 4
Dependent Claim
36 words
(C) about 25-45% by weight of an alkylated melamine formaldehyde cross-linking agent having 1-4 carbon atoms in the alkyl group; and in addition to the film-forming constituents contains about 0.1-2.0% by weight of an acid catalyst.
Claim 5
Dependent Claim
29 words
The coating composition of claim 1 containing pigment in addition to the binder in the amount of about 0.1-30% by weight, based on the weight of the coating composition.
Claim 6
Dependent Claim
18 words
The coating composition of claim 1 in which the acrylic polymers contain about 0.1-30% by weight of styrene.
Claim 7
Dependent Claim
78 words
The coating composition of claim 1 in which the acrylic polymers consists essentially of methyl methacrylate, an alkyl acrylate having 2-12 carbon atoms in the alkyl group, and a hydroxy alkyl acrylate or a hydroxy alkyl methacrylate, each having 2-4 carbon atoms in the alkyl group. wherein the medium molecular weight acrylic polymer has a number average molecular weight of about 5,000-10,000 and the low molecular weight acrylic polymer has a number average molecular weight of about 1,500-4,000.
Claim 8
Dependent Claim
79 words
The coating composition of claim 3 in which each of the acrylic polymers consists essentially of 10-20% by weight of styrene, 10-20% by weight of methyl methyacrylate, 35-48% by weight of butyl acrylate, 20-30% by weight of hydroxyl ethyl acrylate and 0.1-5% by weight of acrylic acid, wherein the medium molecular weight acrylic polymer has a number average molecular weight of about 5,000-10,000 and the low molecular weight acrylic polymer has a number average molecular weight of about 1,500-4,000.
Claim 9
Dependent Claim
17 words
The coating composition of claim 4 or 5 in which the cross-linking agent is hexamethoxybutoxy methyl melamine.
Claim 10
Dependent Claim
28 words
The coating composition of claim 6 in which the catalyst is an alkyl acid phosphate, phosphoric acid, paratoluene sulfonic acid or an adduct of either of said acids.
Claim 11
Dependent Claim
21 words
The coating composition of claim 7 in which the catalyst is an adduct of paratoluene sulfonic acid and an alkyl oxazolidine.
Claim 12
Dependent Claim
45 words
The coating composition of claim 4 containing about 0.5-15% by weight, based on the weight of the coating composition, of a polyhydroxy functional compound which is a solvent for the film-forming constituents and will crosslink with the film-forming constituents on heating of the coating composition.
Claim 13
Dependent Claim
47 words
The coating composition of claim 9 in which the polyhydroxy functional compound is selected from the group consisting of trimethylol ethane, trimethylol propane, trimethylol butane, trimethyl pentanediol, pentaerythriotol, pentanediol, diethylene glycol, dipropylene glycol, triethylene glycol, 2-ethyl-1,3-hexane diol, tripropylene glycol, butanediol and low molecular weight hydroxyl terminated polyesters.
Claim 14
Dependent Claim
25 words
The coating composition of claims 1 or 2 containing about 0.1-20% by weight, based on the weight of the binder, of an ultraviolet light stabilizer.
Claim 15
Dependent Claim
21 words
The coating composition of claim 11 containing about 0.1-5% by weight, based on the weight of the binder, of an antioxidant.
Claim 16
Dependent Claim
21 words
The coating composition of claim 12 containing about 0.1-10% by weight, based on the weight of the binder, of iron pyrophosphate.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-05-17 | 1985-11-16 | 1986-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-17 | 1989-11-16 | 1990-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-17 | 1993-11-16 | 1994-05-18 | $7700.00 | Window Closed / Lapsed |